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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7ec667ea42572bb0407a616f822edbf40bba9e8a8ba13a95fdd7f441fbfb92' 
  AND token = '439vA/+jNSR+Wg2xiClOpB8LtkRv+LDVhHpf9w+dyEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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