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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62ddd67745038a157470690d8fb900cefc08a10cf9f891f6f2a385478637b17' 
  AND token = 'Ald0lNbzFpU8wjS/kvp9iUAC25ESBg9O75Utdyfi+xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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