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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f044c9056470bf30d1c86434091a9d56bbd84e6964e158baf07792834f9421e' 
  AND token = 'eZG+UXGZVwDVKmLXbyoop2Dj0Q3/Gve9mzizjce196A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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