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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6d8d793734862050bb588526b0d69d723e0c55a1494360ad4c486d61c985fc4' 
  AND token = 'ZwvA7oAUO4o4HtA9f4JkaYyKYM40i5/jUU69KVk4AB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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