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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc8e9ae7fa19f6e1ea022050cbe0f2ae930655bdd0c0fd40050330def8561a1' 
  AND token = '52kayaFOBcfA6n2J2ZpDaEIt8rHd1RCk2RXfLeWWaac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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