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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6766d72874ac34f4198419f1b84be467eba3c00e1cba9c09fcaff8d19c58b50b' 
  AND token = 'prS68HVa5+uQQ3PhoLdmS0eRgJgBU/rFkzHJh8t2N7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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