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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7237ed920a7daa8c02f9b2544e4cb34580f522e82490847cf8c7878d4224f7b2' 
  AND token = 'a3aMMo96Oyr5L9lJyT8soQI9DVxlQXXVodLYOiegyc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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