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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5798758b47fe8187775790ff3206b3a3b761abc41b96e13f4b41a8c0fba1c8ca' 
  AND token = '4Desmyvex3R5bbV2MQcpgHRF8tuP53vPi8Cs5F1qtuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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