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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c109403acd9705f509b6a9c057849c1af9dbbdfc392bae69526995012d826e2c' 
  AND token = 'J7xfbH9d8bag1g5RDVbRZpb2PsaF96Bd6zcKRqM2ppQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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