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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96b7c752e79b6ea55ee61d2e727697e82e59dea8d7a65bfc30ba5eb31c0057cc' 
  AND token = 'TLtcHMSW/+c1fTc+0XJ2ge9xXiNCsTWVbil1rQvSCBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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