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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af093de386e49575236f8c24510787ab482a3b64fbe4bfdc6a972f9271aedfa9' 
  AND token = 'OTAkfDFCz90mWngf3KmWWT5C6RVNxMpobpTparoKA1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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