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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d670056d41814e336cd77f5e3fc19fe2c4061c460c6600862c2ce72aa7b00b4' 
  AND token = 'Nwj18vKTXBcFdNye2VmzbKLz8XrhvjEG/e21jpVWuSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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