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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adac8a4b89ad94ca1d6da1aa5ede7b9c7cb75b6a30b878d245b2a1b353b6c708' 
  AND token = '/5yW1aQ1fyCe/b1dUQjcYBp6Kb6on6nBHVuAb90kWEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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