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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08229c1efd076239c978953d81b861d6cdb59830d92a7c96fee34c3f5efe24a0' 
  AND token = 'CEEf5S1p2I1U37bsRxhgL7kXQ/XSUlNTrmgwMHEWluo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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