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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f958e5bf34b21f06fcbc6490a4cb7c36dd0b5ad6756a9915ef85b4f41b6f2d4c' 
  AND token = 'ClIdjmE4m89lIBPq5Zps4ZYpIqfaCbgVx6TH8mhzKQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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