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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c4cbe4df7e20cf9176a29cab3344d81d38fd46af3d8d250c7745a86da59633c' 
  AND token = 'evXivzvxeE4xmqRvjNm4Ph2LsR/u0FFhjJibE+EzvPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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