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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb143273bec33d91134864da4ca2eda71f9103ca8b2a55ff1b25dd6c2184bba2' 
  AND token = 'y5sI4y5DqfyxDzf12+67YJnqAsgkby6Q1tUhgOzwUAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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