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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaee5aabe8834264cf787210c2a3a88eab66297e7c895b0f6b0f83ee742eb7c9' 
  AND token = 'TWJ6Kh6H2ZDmw5Me9Q84kdTGSPj1yGiOuPAgzLjT2Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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