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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe1750ac35fb3f237cc0d5a26e012db5b0881dd2b570577e492311c8dfba0096' 
  AND token = 'a8QQ0GX8B31CxgFZ3mNhUfbLKKSvdj0pSwIFy0VI714=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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