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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9450593793bc4d5140bfcd319efa66aafd952fc5b0e2a04929b417acbd4fc11' 
  AND token = 'REbS8JnJrX0zllWmg6RXVoXRjb/2BRqinfjZ4vX0er0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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