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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40b94b279f4fc460df3b66a33687ab28ee9ebc9d7784d601e617fca1e143e6cf' 
  AND token = 'gboKkls9lALHWXb5DXE/R4S0zTiKcXMF6HTV9JXVZLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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