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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a7947a61cf699e2615d570d006808c7f7fa62c9936ac15195b2c2a3d713eb5' 
  AND token = 'ovUcNkd8XYWH2iGtBZNbQZ4jTvCdV46tRoO163lwr0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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