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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cb3a1d0739267d7c69bb8068cd6fb7c2c1cb4ad904360ea3537a201c706ba1' 
  AND token = 'o0lryj6FOCi0wZV3V0opSHq0zyq7PtGrSsW0QJMvbvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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