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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddd40e80c9f749c74eaab8295993e3528e86409c153a545c04d9ba12c9576ee' 
  AND token = '6sXzFAqT8wSOK8nwUJ5pM4je0y/okEmFr+fikArmOYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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