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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d996f9d13d2851ccd116f2024d9284bb10a88c9da62ea8e3676a9e9278cd426' 
  AND token = 'CnWkwBWVAlqeCaxpKH6XhXi8o9bIPPAz2kIqo/TmS+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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