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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7329d1b78639f0c23b400eb5f8e636a701fa21641dc38949c55223906cab4b92' 
  AND token = '82XOvuT5iIrqqYocEA9k+IX3E8jsPK+p2R6J5yDNJns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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