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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a027db85ed2eacb77c53b664cdbcd27341a25b03d7de4646a19123f4bc4585c0' 
  AND token = 'qPFmqbMWEQEPY60r289SwLAVjc0H4RfHfwOQFd8GiE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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