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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8016d2518bdb46f840b619c8a31b9ee8927371ee154f3c02230727b1c3d7e6' 
  AND token = 'ug4l4QoXKMjqGCXsymTLoaoZrqkexirQZLiLVEs4GpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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