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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ad4d53d9d13d2534f6a72c988284b07aeb1b8a9fdc796c5840872231caa9a0' 
  AND token = '8aoitC/7UUL9O5KTd+tMv3HE55/IQyxMRPQc7s40b+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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