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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda37688c3202867870725005922e7ede77b86610f0d6156828f322003971bff' 
  AND token = 'U6y/WVW4K0hU+OArK4ZjkRr3FSKSxctIJVyFmnq+5jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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