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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7973368fe943edcb41cb32bfffc8e289cdc06446c341f5cc43d27458926ff49d' 
  AND token = 'Q9ggHnDl0MjUn3/2bdNjrIGMiGlZKxINe2mDFD3BICU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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