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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834d1d8cecf2d69742c367f6e7758b4f17e0b85bb2d06e4a3783e0ea9630e1a7' 
  AND token = 'jUvxRMDUXGfM/T0h3NdOPIX4ZrVrWWuic78Ia37Ht/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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