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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981a8921acf11f322fc496ef2fe0165ec51ad9ad2ebf8b44a6ad130b6ad7c6bd' 
  AND token = 'ScIeGxEkmRNgojZgY2Gy0NMEKWRDM+4vh9Lu3Oh0cpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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