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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fd916f0491ed129650a6ae79241e0d5854a1d14b6fd7c4fefb1acf731b2664e' 
  AND token = 'CY5ZYsVO/ACY8Cr8T/J0wRoceff2pkp1B2kZKUlNWQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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