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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0822bff3aa0f01b69e828cfaab2b5271f3f63005f9bfbfcb374d4fb6669b5d33' 
  AND token = 'zxam1mr0ejIgKyPc7/Fm44yGJm3lAFDNYIoHZ02fj+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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