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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77556827a7a28a499b16aacedeeecd40a072ad0e4a6e101b9c80b9d71d8b95a9' 
  AND token = 'nTd8ECyouftN7ThLH7kohXl9a3pFJLBJ9wQ0KcEe4cY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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