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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e19df4cb2f154e58a559ab932823e96f569b3ac48320e7e09e5ba85bf15ca7' 
  AND token = 'XlgSXoq52+nhb9btcuy9scFk6/NHTEuDTRlDNHHbBo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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