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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787dec285a75bd59ee30ab1f3a398e373009714edbf9b93f862b72136b8d6cc3' 
  AND token = 'PnIQkbaFnzgYWClQ8jkRSmPmLVJ1ese2IShZIp4birI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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