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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7360334d7eebc2e1b562fad6e1fc2a677de4a02e2c2c2effb1edceec26a5e6' 
  AND token = '9r5/6ExevlPLNGXfVMu/oUw+QTom4ZqqGICP5RGLQ1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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