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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040984e1339a4ba6f1dba33a6f6455f003ce644ff3d270a50219c2c0ef198aa7' 
  AND token = '/6K1PRMdtOWzcHgJtTZtGcV4L2rIloP5Ty+sY8O3uUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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