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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8deeef8d2e8c4e5e49bba9b3b8333ceb0ab88acde8c7e61d84d43a14475161f' 
  AND token = 'pTjhKZjBq/aLUj3k4FrRwngQLvNX2xS7P4oQFJBxfUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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