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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '498e44affa57a61b613a1bbf955209b79b824949378d20b50832cb430cd2f0bc' 
  AND token = '/UOYDfbFAJuVCvfCOUmcK1uZOE3N8U44UMSvfam1gAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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