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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815ec684b1c3932efb3eb252e2dc0639673e399598fed5532e866af49a8edd3e' 
  AND token = 'dDyUXKVFL9MhL434Oh4xQZuO9k6pSHWVI3GAye39PZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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