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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73262eb2d39938e2a42f2e9c8c6bfc98602629c7ad65eae3084b18dfecc16af9' 
  AND token = 'VtjtKko/ZM46kqMf43t9CmFStxB9cCRVk0FDU1p2P/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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