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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a63fa38684827497bf1be33d88d7c64b42d1b8c39561033ef6ee5f9cb9a72d6' 
  AND token = 'rHTRD5iTn0iRrZ92T/up/U6M7JlspjHEkdqJDWGRIIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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