SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8edfab937785ca76d653a10a62e5a2fb85c25393723906fad4ee2419b8c1bde7' 
  AND token = 'BUlPQJ+J3m5r5X4DKNmG/ULmXbDvcLF0rUuVFTBdU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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