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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '692f723f842f8d9c2ad3ab6783ea688529444838f6ea6cf8a7865b3d0e7cd84c' 
  AND token = 'hn+SjSwj4sW4WIbwJksV0v3JImkrxcy8t9CrY2v7mxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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