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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f53eaaa4b3de169393ad6af435d97ba70fa33280e41c7a8f9e81eaa0a57cb36' 
  AND token = 'C0d6999VtAEtz2jwyuEehhBojKezB8jlRQGJtTAbs4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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