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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '307cce36e2cfcaf07c2c81a3afa85185b49f1426063f6b9eb91bf4f4eef5df1e' 
  AND token = 'wtvrzR5MCm/cMe470UAl334crIwmt45WqKq+mBpPAPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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