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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a785a2327a2997612efcf6fcff77e5277540edda9b1f17dc187c9f2c56cfff76' 
  AND token = 'SGYIoFj5lM14vJ2FHQqgew3Nf/ymAKdPqH9QRyldzb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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