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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5007b5b6e840cf995191a0e23907a99c3e5b25f25cd89f41d969cc63deb61d20' 
  AND token = 'er9YtjWSiEkMRwcXt85E7dWbA87LXFiN15ahdbSzT+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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