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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7551f0e33b05b3971083349aef3e6c0a1e93fdc698f62f3b84d8b6346fa60318' 
  AND token = '0Lg+Ovx2EdgHojU5MmwuJQ2gPqswFqUdkEvDrMoIdgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}