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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebaeed929813073e4c85ef9fb0782c1cbe66da8d81f45db2b37734ac34088a0' 
  AND token = 'bbFXpWqmnjGF+81BwJZcZJ2ix8EX2Wf2bZ0hzucSXSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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