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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077d7c176e3f7cd2ac29e0bf98a9e20df837a305ad9a080b1a5c530532accbde' 
  AND token = 'Vqnn7wdJFlRRUc1SwZT4LK6I2dBeTyT5THqJw9CV1jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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