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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '820244f4eca52c075e2cb4d79b8a8b56fa1430e9ea08f2dd4c3d1ae46b5d656c' 
  AND token = 'uqIKrtUEEXMpfsZPX1NTYYVsYkSWiy/0ash2Dla5iDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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