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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b0cca577ae7d789bb70187199c5b90e48dc4f083756eac5a41c1a443028f4b4' 
  AND token = 'gE/6+VlO40ilXubZpHBkz5zbPVkSmg59Se0xVz3ybak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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