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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb04b06cd79cea3a5d1a9465b9b29e8e1a265ab1f45b78fec0e4828d1033bbfe' 
  AND token = 'qebPiFPloxdIpLWxeuOc0Wbe/iTnlGTXKUuCZHfV2q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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