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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4bdb21fec43c85712df786337b00d298f646237200ea1d43f3ae588eedd225' 
  AND token = '9L42D+eekvw7elngWODqq7csqaGhnSvOVdhTis9q1U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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