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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5cc739f27b800a1cba000a97f0691e4a7ce6ae6062ac4ffe29425792d7c30c' 
  AND token = '7tLwWH3V5NhRoFnVJ4MqicdO6GJQ9pDOSlJiDYY5IUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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