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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ba69f1ed7d5097973c621c4a69ef47d3808e02ec8e22003499ee3e5af04e32' 
  AND token = 'xx9iebaHLr4e2q8zrYhycroOIA06phnYq6IG1u7NP8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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