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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254318108a790d72d91efde1259e8ab5734222e6e5f0e80be7a936c111a969d1' 
  AND token = '0VeQbrnzRNJ7M4hYNwoB1vv2HN0aZ8LW8hInZvoghzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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