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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d73e232f6746d495fe0ee46ec70c5bd72747ca02e7877cef87c5ca6cb7ed392' 
  AND token = 'InPrONfK3Tvo+/8wfhrrKLBUNiPy5KV3IN/czIdiK8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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