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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12848e5b31971ecc69052024697c0b3ed1bb33d5e9ab957b86076980d5b2933a' 
  AND token = 'Gk7YL11o9S215pwPVR5IV8awVxnLvxroiklmKj+KJQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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