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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a889f81d54dd30d2588b45618455c6a12606c53fcffbebe0c8a56b462a22525' 
  AND token = 'Z6n1FTpKzhMl445VT4dWnGh/SadIaOMd0dPCYh2Kf80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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