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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '593fa3b989e4ebef9b0d068c58f81567ba1ad580a5d9d1e4a5ea4964a801cf5f' 
  AND token = '+EruTc5IjSCKoRfHXM4yQU65pveDVxhXaozzH61RFzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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