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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaeb7fcdea7f73d7a44ef9071c4fe8ec576d9eda953d844079d806caf1522cdc' 
  AND token = 'ITD/k37VIiK7sJazL3105QWuRxRhtZy6+sffwxnoFGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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